In the area of these micropyls, cycads and some coniferous plants excrete a drop of liquid that draws the pollen capillary to the embryo sac as it dries up and z. B. should "encourage" germination through a high sugar concentration.
The micropyle, which is also referred to here as a micropylar cup, is a bulge in the outer egg shell (exochorion) of some insects , e.g. B. the butterflies and the ghosts into which the sperm can penetrate. This is located either on the top or on the back of the egg. In butterflies, it forms a rosette-shaped structure. In the case of the ghosts, it is surrounded by a micropylar plate, which is usually shaped specifically for the species.
Different types of micropylene occur in the eggs of different fish species.